ML19326B391

Ro:On 741025,leak Found on Cold Leg Drain Loop of Reactor Coolant Pump 180 Degrees from Previous Weld Flaw Identified in AO 50-313/74-9.Pump Immediately Shutdown

ML19326B391
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/26/1974
From:	Phillips J ARKANSAS POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19326B382	List: ML19326B381 ML19326B388 ML19326B391
References
NUDOCS 8004150760
Download: ML19326B391 (1)

Text

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3 NORMAN C HOSELEY, DIRECTOR OF UNITED STATES ATOMIC ENERGY COMMIS$!ON 3l DIRECTOR OF REGULATORY OPERATIONS REGION II SUITE 818 230 PEACHTREE ST NORTHWEST q p' i ATLANTA GA 30303 qU)

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A LEAK RATE CALCULATION AT APPROXIMATELY 1400 HOURS ON 10-25=74 INDICATED APPROXIMATELY 4 GALLONS PER MINUYE LEAK IN REACTOR COOLANT SYSTEM WHILE AT 75 PERCENT POWER BEGAN IMMEDIATE PLANT SHUTDOWN 3 AND C00LDOWN. REACHED COLD SHUTDOWN AT APPROXIMATELY 300 HOURS ON 10-26-74 LEAK WAS FOUND IN B LOOP B RE ACTOR COOLANT PUMP' COLD

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LEG, COUPLING TWO ONE AND ONE HALF INCH WELD ON COLD LEG DRAIN.

FAILURE WAS IN THE SAME WELD AS IDENTIFIED IN ABNORHAL OCCURRANCE RED 0RT NO. 50-313/74-9 BUT 180 DEGREES FROH PREVIOUS WELD FLAW.

SPOOL PIECE AND COUPLING WILL BE REMOVED FOR EXAMINATION, DETAIL 3' s STRESS ANALYSIS OF THE LINE WILL BE DONE. DUE TO PROMPT IDENTIFICATION l 0F A LEAK AND IMMEDIATE SHUTDOWN AND COOLDOWN THIS PRESENTED'NO HAZARD TO THE HEALTH AND SAFETY OF THE PUBLIC 3 J D PHILLIPS VICE PRESIDENT ARKANSAS J0WER AND LIGHT THE ARKANSAS I NUCLEAR ONE Oj 16:19 EDT HGMATLT HSB 35

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